TAS2555YZT - 5.7W Mono Class-D Smart Amp | Texas Instruments
MPN： TAS2555YZT ✓ 啟用中TAS2555YZT 概覽
A smart amplifier (SmartAmp) is a Class-D audio amplifier whose digital signal path is actively managed by an embedded DSP. Unlike a conventional analog-input Class-D stage, the TAS2555 class of device receives digital audio directly (I2S/PCM), so EQ, loudness, dynamics processing, and speaker protection are all computed on-chip rather than in an external host processor. This raises the audio subsystem from a simple power stage into a full speaker-driver SoC.
Key features include 5.7 W of continuous mono output power into a 4 ohm load, an integrated Class-H boost stage that raises the internal supply rail to 8.5 V for higher peak swing, integrated short-circuit and thermal protection, and advanced on-chip EQ. Because the amplifier senses both speaker voltage and speaker current, it can estimate cone excursion and thermal condition in real time, protecting the speaker without external current-sense resistors. The part is specified for -40 degrees C to 85 degrees C ambient operation and is currently Active.
Architecturally the device is a full system on a chip: the ultra-low-noise DAC converts the digital stream to analog, the Class-D modulator drives the power stage, and the low-latency DSP closes the loop with the sensing circuitry. This tight analog-digital integration is what allows the protection algorithms to react in time to prevent thermal or excursion damage at high playback levels, which is difficult to achieve with an external protection IC and a discrete amplifier.
Typical applications include Bluetooth and Wi-Fi speaker products, portable speakers, soundbars, smart-home display speakers, multi-room audio nodes, and voice-assistant devices where a small, low-voltage, high-efficiency mono driver is needed. The 42-ball DSBGA package makes the part suited to compact consumer hardware where board area is limited and where a full DSP-based protection function adds value over a basic Class-D IC.
When designing around the TAS2555YZT, pay close attention to layout: the speaker sensing inputs and the Class-D output stage require careful return-path planning, and the BTL output means the speaker terminals carry full swing relative to ground. Decoupling on the 1.65 V to 1.95 V rail should follow the datasheet reference layout, and the boost rail needs its own local ceramic energy reservoir for transient headroom.
This page synthesizes verified distributor pricing, drop-in ordering alternatives, parameter-by-parameter comparison data, and practical layout and thermal design guidance that are not consolidated in the manufacturer datasheet itself, so engineers can qualify the part before committing to a PCB spin.
直接替換替代品，適用於 TAS2555YZT — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： TAS2555YZT （相同外形與佔位） — 差異在於 Operating Temperature Range.
TAS2555YZR
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →TAS2559YZT
✅ 直接替換聯絡詢價
查看資料表 →TAS2557YZT
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →TAS2555YZT 最大額定值與電氣特性
| Device Type | Digital-input Class-D smart audio amplifier (system on a chip) |
| Output Channel Configuration | 1 channel (mono) |
| Amplifier Class | Class D with Class-H boost |
| Maximum Output Power | 5.7 W x 1 into 4 ohm |
| Boost Output Voltage | 8.5 V Class-H boost rail |
| Supply Voltage Range | 1.65 V to 1.95 V |
| Audio Input Interface | Digital (I2S/PCM) input with integrated DAC |
| Integrated DAC | Yes, ultra-low-noise audio DAC |
| Speaker Feedback | Integrated speaker voltage and current sensing |
| DSP | On-chip low-latency DSP running TI SmartAmp protection algorithms |
| Protection Features | Integrated speaker protection, short-circuit protection, thermal protection |
| EQ | Advanced on-chip EQ |
| 封裝 | 42-pin DSBGA (YZ) |
| 安裝類型 | Surface Mount |
| 工作溫度範圍 | -40 degrees C to 85 degrees C (TA) |
| Part Status | Active |
| Datasheet Size | 879 KB, 12 pages |
TAS2555YZT 42-pin dsbga (yz) 腳位配置指南
TAS2555YZT（42-pin dsbga (yz) 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： TAS2555YZT.
請參閱 資料表 以查看完整腳位配置。
典型應用
TAS2555YZT 適用於 6 應用s: Bluetooth and Wi-Fi Speaker Drivers, Portable and Battery-Powered Audio Products, Smart Display and Voice Assistant Speakers, Soundbar and Home Theater Satellite Drivers, Industrial and IoT Audio Notification Modules, USB-C and Docking Audio Accessories.
Bluetooth and Wi-Fi Speaker Drivers
The TAS2555YZT suits compact wireless speakers because the Bluetooth or Wi-Fi application processor can feed audio directly over I2S, eliminating an external codec and analog preamp, while the on-chip SmartAmp DSP still performs EQ and speaker protection. With 5.7 W of mono output into 4 ohm and an 8.5 V Class-H boost, the device has the peak swing needed for a single small driver in a pocket or desk enclosure. The trade-off is that the boost converter and its local ceramic reservoir must be laid out exactly per the TI reference design, because poor reservoir sizing is the most common cause of bass clipping and current-limit throttling in this topology.
推薦
Portable and Battery-Powered Audio Products
Running from a 1.65 V to 1.95 V rail, the TAS2555YZT is well matched to single-cell Li-ion powered portable products where every milliamp and every square millimeter of PCB area matters. The integrated DAC removes a separate low-noise audio converter, and the 42-ball DSBGA footprint is small enough for a slim enclosure. Because the amplifier senses speaker voltage and current, the protection algorithms can restrain output during thermal soak rather than relying on a fuse, which preserves battery life by avoiding over-drive. Verify that the boost inductor and the output capacitors are rated for the peak boost rail of 8.5 V with margin.
推薦
Smart Display and Voice Assistant Speakers
Smart-home display and voice-assistant products typically need a single high-quality speaker driver plus low idle current and small board area. The TAS2555YZT addresses all three: 5.7 W of mono Class-D output in a 42-ball DSBGA, digital audio input that removes analog conditioning, and on-chip EQ that a host processor can tune without a discrete preamp. The integrated short-circuit and thermal protection is also valuable in products where the enclosure runs warm. A key design consideration is that the SmartAmp configuration is normally delivered through TI tuning tools, so budget time for speaker characterization rather than expecting a drop-and-forget analog sound.
推薦
Soundbar and Home Theater Satellite Drivers
In a soundbar or compact home-theater satellite, each driver is typically a small 4 ohm or 8 ohm unit driven by a mono channel. The TAS2555YZT provides 5.7 W into 4 ohm with an 8.5 V boost, enough headroom for a satellite driver while keeping the digital audio path intact from the main SoC. Integrated speaker protection matters in multi-driver cabinets where a single shorted driver should not take down the whole system, and the low-latency DSP reacts faster than an external analog protection circuit. Confirm the 42-ball DSBGA land pattern and the exposed-ball thermal path are compatible with your assembly and rework process.
推薦
Industrial and IoT Audio Notification Modules
Industrial panels, IoT gateways and notification modules often need loud, efficient mono audio in a confined enclosure with a low-voltage supply. The TAS2555YZT fits because Class-D efficiency and the 8.5 V boost deliver high acoustic output from a 1.65 V to 1.95 V rail, while the -40 degrees C to 85 degrees C ambient rating covers industrial temperature ranges. On-chip short-circuit and thermal protection improves field reliability where the device may be driven into poorly controlled cabinets. Because the amplifier is a digital-input device, the module designer must supply a stable clock and correctly formatted I2S frames from the host MCU.
推薦
USB-C and Docking Audio Accessories
A USB-C docking speaker or monitor audio puck benefits from the TAS2555YZT because the digital stream can be routed straight from a USB audio controller into the amplifier, avoiding analog losses and an extra codec in a very small enclosure. The 42-ball DSBGA footprint leaves room for connector, protection and passives in a dense mechanical design, and the 5.7 W mono rating is well matched to a single full-range driver. Integrated protection reduces the risk of an over-driven small driver failing in the field. Note that the device itself needs the 1.65 V to 1.95 V rail, so a boost supply ahead of the amplifier is required for USB bus power.
推薦
推薦產品摘要
工程參考資料，適用於 TAS2555YZT — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | TAS2555YZR | TAS2559YZT | TAS2557YZT |
|---|---|---|---|---|
| Package | 42-pin DSBGA (YZ) | 42-pin DSBGA (YZ) - same | 42-pin DSBGA (YZ) - same | 42-pin DSBGA (YZ) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Input Interface | Digital (I2S/PCM) with integrated DAC | Digital (I2S/PCM) with integrated DAC | Digital input smart amplifier | Digital input smart amplifier |
| Speaker Protection | Integrated SmartAmp with speaker V/I sensing | Integrated SmartAmp with speaker V/I sensing | Integrated SmartAmp protection | Integrated SmartAmp protection |
| Short-Circuit / Thermal Protection | Yes - integrated | Yes - integrated | Yes - integrated | Yes - integrated |
主要差異化特點
- Higher continuous output power in the same 42-ball DSBGA smart-amplifier footprint (對比TAS2557YZT)
- On-chip speaker protection removes external current-sense hardware and an external protection IC (對比MAX9713ETJ)
- Digital audio input eliminates the external codec and analog preamp (對比TPA3131D2RHBT)
- Low-voltage 1.65 V to 1.95 V operation suited to single-cell designs (對比TAS2555YZR)
設計說明
The TAS2555YZT relies on its Class-H boost converter to create the 8.5 V internal rail, so the boost inductor and its local ceramic reservoir must be placed exactly as in the TI reference layout, with a very short and wide loop between the switching node and the device. Keep the speaker voltage and current sensing traces away from the switching node and boost inductor, since coupled switching noise corrupts the feedback the SmartAmp algorithms depend on. Use a solid ground plane under the DSBGA and stitch the exposed-ball thermal path into the amplifier and system ground.
Estimated power budget for planning: at 5.7 W output into 4 ohm the Class-D stage delivers roughly 5.7 W plus switching and conduction losses, while the system rail only needs to supply the average audio power at high efficiency of the boost plus amplifier chain. Provide generous low-ESR ceramic decoupling on the 1.65 V to 1.95 V rail and check the boost inductor saturation current against peak output current plus margin. Estimated: the current delivered to the load at 5.7 W into 4 ohm is about 1.2 A RMS, so the switching path and inductor must be rated well above that for the boost converter.
Do not treat the TAS2555YZT as an analog-input amplifier: driving the digital input with an analog signal, or powering the digital interface rail out of sequence relative to the Class-H boost, will prevent correct operation. Do not substitute a part in the same DSBGA family without re-running the speaker protection tuning for the new driver, because the excursion and thermal models are tied to the speaker. Finally, verify the 42-ball DSBGA land pattern and the manufacturing stencil, since a 42-ball fine-pitch BGA is not a drop-in footprint for the TQFN packages used by competitors such as the MAX9713ETJ.
A boost converter inside an audio amplifier is the main source of both radiated and conducted emissions in this design. Keep the boost switching loop tight, place the inductor away from the microphone and speaker sensing lines, and use the shortest possible ground return for the power stage. The integrated speaker voltage and current sensing makes the amplifier more susceptible to EMI-induced errors than a simple analog-input Class-D stage, so filtering at the sensing inputs and a well-shielded enclosure are recommended when the device sits close to an RF radio. Compliance measurements should be repeated after any change to the boost layout.
合規資訊
The verified data set for the TAS2555YZT contains only the manufacturer ordering information, datasheet availability, part status (Active), package (42-pin DSBGA YZ), electrical headline specifications, and distributor listings. No explicit RoHS, REACH, lead-free, halogen-free or conflict-minerals statements appeared in the retrieved sources, so these fields are recorded as unknown rather than assumed. AEC-Q100 is marked not_applicable because the -40 degrees C to 85 degrees C commercial temperature grade in the verified data does not correspond to an automotive-qualified ordering code.
